The main device (symbol) in the Nabram blazon is the paly. The two main tinctures (colors) are sable and argent.
Sable, the deep black so often found in Heraldry is believed to named from an animal of the marten family know in the middle ages as a Sabellinœ and noted for its very black fur 1A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Sable. In engravings, when colors cannot be shown it is represented as closely spaced horizontal and vertical lines, and appropriately is thus the darkest form of hatching, as this method is known 2Boutell’s Heraldry, J.P. Brooke-Little, Warne, (revised Edition) London 1970, P 26. Although it may seem a sombre tone, and does indeed sometimes denote grief, it is more commonly said to represent Constancy 3The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P35.
Argent is the heraldic metal Silver and is usually shown as very pure white. It is also known more poetically as pearl, moon (or luna) 4Understanding Signs & Symbols – Heraldry, S. Oliver & G. Croton, Quantum, London, 2013, P53. In a sketch or drawing it is represented by plain, unmarked paper 5A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1847, P11.
Play is what is known as a treatment, a regular patterning, usually over the whole background of the shield. The word comes from the pale, the major vertical stripe that appears on some shields, paly is obvious its little cousin, consisting of, typically, 6 or more vertical stripes, alternately coloured 6A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Paly. The stripes can be any combination of the heraldic tinctures, an early example is that of GURNEY, being simply paly of six, or and argent. Paly can be combined with other effects, such as decorative edges on each stripe, or overlaid with other treatments such as bendy, and these can be very effective and pleasing to the eye 7A Complete Guide to Heraldry, A.C. Fox-Davies, Bonanza (re-print of 1909 Edition), New York, 1978, P121.